1. An optical arrangement for receiving a response signal returned from a device under test\u2014DUT\u2014in response to a stimulus signal received from a light source, comprising:
a first splitter for receiving the response signal and for wavelength dependent splitting the response signal into a first partial signal and a second partial signal,
a second splitter for receiving the second partial signal and for wavelength dependent splitting therefrom a third partial signal with a third spectral component,
an optical detector for receiving the first partial signal and the third partial signal and detecting an optical power of the received signals,
an optical shutter arranged to be moved to either let through to or block from the optical detector one of: the first partial signal and the third partial signal, and
a first optical path for conducting the response signal from the DUT to the first splitter, a second optical path for conducting the second partial signal path from the first splitter to the second splitter, a third optical path for conducting the third partial signal from the second splitter, over the optical shutter to the first splitter, and a fourth optical path for conducting the first partial signal and the third partial signal to the optical detector.
2. The arrangement of claim 1, wherein the first splitter and the second splitter are free space optical elements, and wherein the optical signals are free space optical beams.
3. The arrangement of claim 2, wherein
the first splitter is arranged to receive the response signal from the first optical path at a first surface, to let through the first partial signal from the first optical path to the fourth optical path and to reflect the second partial signal from the first optical path to the second optical path, and to receive the third partial signal from the third optical path at a second surface opposite to the first surface and to reflect this third partial signal to the fourth optical path,
the second splitter is arranged to receive the second partial signal from the second optical path, and to let through the third partial signal from the second optical path to the third optical path.
4. The arrangement of claim 3, wherein the third optical path is directed over a first and a second retro reflector, so that second optical path and the third optical path form a parallelogram.
5. The arrangement of claim 3, wherein the optical shutter is realized as rotatable light-impermeable cylinder comprising a through hole.
6. The arrangement of claim 1, for receiving the stimulus signal at the second splitter and to conduct this signal over the first splitter to the DUT in opposite direction to the second partial signal and the response signal.
7. The arrangement of claim 1, wherein the first partial signal is one of: an Anti stokes signal with a center wavelength at a first response wavelength and a Stokes signal with a center wavelength at a second response wavelength, and the third partial signal is the other of the Stokes signal or Anti stokes signal and wherein the distributed physical property is a temperature profile along at least a part of the DUT.
8. An optical arrangement for receiving a response signal returned from a device under test\u2014DUT\u2014in response to a stimulus signal received from a light source, comprising:
a first splitter for receiving the response signal and for wavelength dependent splitting the response signal into a first partial signal and a second partial signal,
a second splitter for receiving the second partial signal and for wavelength dependent splitting therefrom a third partial signal with a third spectral component,
an optical detector for receiving the first partial signal and the third partial signal and detecting an optical power of the received signals,
an optical shutter arranged to be moved to either let through to or block from the optical detector one of: the first partial signal and the third partial signal, and
a processing unit for controlling the optical shutter, to receive from the optical detector a first power information related to a first position of the optical shutter and a second power information related to a second position of the optical shutter,
and to determine an optical property of the DUT as a function of the first power information and the second power information,
wherein the DUT is an optical fiber of a defined length, wherein the response signal comprises light backscattered over a time period corresponding to the travel time of the stimulus signal through the DUT, and wherein the first power information and the second power information are functions over time, and wherein the processing unit determines a physical property over the length of the DUT on the base of the first power information the second power information and the velocity of light within the DUT.
9. An optical arrangement for receiving a response signal returned from a device under test\u2014DUT\u2014in response to a stimulus signal received from a light source, comprising:
a first splitter for receiving the response signal and for wavelength dependent splitting the response signal into a first partial signal and a second partial signal,
a second splitter for receiving the second partial signal and for wavelength dependent splitting therefrom a third partial signal with a third spectral component,
an optical detector for receiving the first partial signal and the third partial signal and detecting an optical power of the received signals,
an optical shutter arranged to be moved to either let through to or block from the optical detector one of: the first partial signal and the third partial signal, and
a processing unit for controlling the optical shutter, to receive from the optical detector a first power information related to a first position of the optical shutter and a second power information related to a second position of the optical shutter, and to determine an optical property of the DUT as a function of the first power information and the second power information,
wherein the processing unit controls the light source such that the stimulus signal comprises a sequence of optical pulses, to determine a first correlation function by correlating said sequence with the first power information, and a second correlation function by correlating said sequence with the second optical power information, and to determine the distributed physical property on the base of the first correlation function and the second correlation function.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A non-transitory computer program product for managing media storage, the computer program product comprising:
one or more computer-readable tangible storage media and program instructions stored on the one or more computer-readable tangible storage media, wherein the one or more computer-readable tangible storage media is hardware, the program instructions comprising:
program instructions to determine that storage space is needed on a storage device, wherein the storage device stores one or more media files;
program instructions to select a media file from the one or more media files, based, at least in part, on a scheduled time for conversion of the media file, and a user selection of a first media file including a children’s program to convert before a second media file is selected, and one or more of: indicated content of the media file, a media genre, wherein a viewing quality of the media genre is not impacted by conversion to a same extent as one or more other genres, a viewing history of the media file, wherein the viewing history indicates a media file a user is least likely to watch, and one or more user preferences associated with the media file, wherein the one or more user preferences include one or more of: a user preference for a first media content to be selected for conversion before a second media content, and a user selection of a content to convert to the second format;
program instructions to determine a likely viewing device for the media file selected from the one or more media files, based, at least in part, on the viewing history of the media file, wherein the viewing history includes at least a viewing device previously used for the media file, and one or more of: a media file a user is unlikely to watch, and a viewing device on which a media genre is previously watched;
program instructions to convert the media file from a first format to the second format, based on the determined likely viewing device;
program instructions to store the converted media file in the second format;
program instructions to remove the media file in the first format from the storage device; and
program instructions to update one or more internal processes to access the converted media file in the second format.
2. The computer program product of claim 1, wherein the one or more media files include one or more of: an audio file, a video file, or a data-broadcast file.
3. The computer program product of claim 1, wherein program instructions to determine the likely viewing device further comprise:
program instructions to request, from a communication network, one or more details of a viewing device, wherein such details include one or more of: a display resolution, a display size, and a processing property of the viewing device; and
program instructions to determine the likely viewing device based on at least one of the one or more details of the viewing device.
4. The computer program product of claim 1, wherein the determined likely viewing device includes one or more of: a televising device, a personal computing device and a mobile computing device.
5. The computer program product of claim 1, wherein the second format is a lower quality digital format than the first format.
6. A computer system for managing media storage, the computer system comprising:
one or more computer processors;
one or more computer-readable tangible storage media;
program instructions stored on the one or more computer-readable tangible storage media for execution by at least one of the one or more computer processors, the program instructions comprising:
program instructions to determine that storage space is needed on a storage device, wherein the storage device stores one or more media files;
program instructions to select a media file from the one or more media files, based, at least in part, on a scheduled time for conversion of the media file, and a user selection of a first media file including a children’s program to convert before a second media file is selected, and one or more of: indicated content of the media file, a media genre, wherein a viewing quality of the media genre is not impacted by conversion to a same extent as one or more other genres, a viewing history of the media file, wherein the viewing history indicates a media file a user is least likely to watch, and one or more user preferences associated with the media file, wherein the one or more user preferences include one or more of: a user preference for a first media content to be selected for conversion before a second media content, and a user selection of a content to convert to the second format;
program instructions to determine a likely viewing device for the media file selected from the one or more media files, based, at least in part, on the viewing history of the media file, wherein the viewing history includes at least a viewing device previously used for the media file, and one or more of: a media file a user is unlikely to watch, and a viewing device on which a media genre is previously watched;
program instructions to convert the media file from a first format to the second format, based on the determined likely viewing device;
program instructions to store the converted media file in the second format;
program instructions to remove the media file in the first format from the storage device; and
program instructions to update one or more internal processes to access the converted media file in the second format.
7. The computer system of claim 6, wherein the one or more media files include one or more of: an audio file, a video file, or a data-broadcast file.
8. The computer system of claim 6, wherein program instructions to determine the likely viewing device further comprise:
program instructions to request, from a communication network, one or more details of a viewing device, wherein such details include one or more of: a display resolution, a display size, and a processing property of the viewing device; and
program instructions to determine the likely viewing device based on at least one of the one or more details of a viewing device.
9. The computer system of claim 6, wherein the determined likely viewing device includes one or more of: a televising device, a personal computing device and a mobile computing device.
10. The computer system of claim 6, wherein the second format is a lower quality digital format than the first format.